EP4596166A1 - Verfahren zur herstellung eines beschichteten lichtbogenschweissstabes und einer schweissverbindung - Google Patents

Verfahren zur herstellung eines beschichteten lichtbogenschweissstabes und einer schweissverbindung

Info

Publication number
EP4596166A1
EP4596166A1 EP22961043.1A EP22961043A EP4596166A1 EP 4596166 A1 EP4596166 A1 EP 4596166A1 EP 22961043 A EP22961043 A EP 22961043A EP 4596166 A1 EP4596166 A1 EP 4596166A1
Authority
EP
European Patent Office
Prior art keywords
content
oxide
total
disclosure
flux
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22961043.1A
Other languages
English (en)
French (fr)
Other versions
EP4596166A4 (de
Inventor
Hajime MATSUO
Takahiro Kamo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Publication of EP4596166A1 publication Critical patent/EP4596166A1/de
Publication of EP4596166A4 publication Critical patent/EP4596166A4/de
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
    • B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
    • B23K35/0261—Rods, electrodes, wires
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • B23K35/3053—Fe as the principal constituent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • B23K35/3053—Fe as the principal constituent
    • B23K35/3066—Fe as the principal constituent with Ni as next major constituent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • B23K35/3053—Fe as the principal constituent
    • B23K35/3073—Fe as the principal constituent with Mn as next major constituent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
    • B23K35/3601—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
    • B23K35/3602—Carbonates, basic oxides or hydroxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
    • B23K35/3601—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
    • B23K35/3603—Halide salts
    • B23K35/3605—Fluorides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
    • B23K35/3601—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
    • B23K35/3607—Silica or silicates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
    • B23K35/3601—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
    • B23K35/3608—Titania or titanates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
    • B23K35/3601—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
    • B23K35/361—Alumina or aluminates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
    • B23K35/362—Selection of compositions of fluxes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
    • B23K35/368—Selection of non-metallic compositions of core materials either alone or conjoint with selection of soldering or welding materials
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/10—Ferrous alloys, e.g. steel alloys containing cobalt
    • C22C38/105—Ferrous alloys, e.g. steel alloys containing cobalt containing Co and Ni
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese

Definitions

  • the present disclosure relates to a shielded metal arc welding rod and a method of manufacturing a welded joint.
  • an austenitic shielded metal arc welding rod with which a weld metal having excellent low-temperature toughness can be obtained is used.
  • the shielded metal arc welding rod is mainly designed to have a Ni content of 70%.
  • Patent Literature 1 discloses a "flux-cored wire containing, as a core wire, a Ni-based alloy, a Ni content being from 35% to 70%, the flux containing TiO 2 , SiO 2 , and ZrO 2 in a total amount of 4.0 mass% or more with respect to a total mass of the wire, further containing a Mn oxide in an amount of from 0.6 mass% to 1.2 mass% in terms of MnO 2 , and when contents of TiO 2 , SiO 2 , ZrO 2 , and MnO 2 (converted amount) are represented, by mass%, as [TiO 2 ], [SiO 2 ], [ZrO 2 ], and [MnO 2 ], respectively, [TiO 2 ]/[ZrO 2 ] being from 2.3 to 3.3, [SiO 2 ]/[ZrO 2 ] being from 0.9 to 1.5, and ([TiO 2] + [S
  • Patent Literature 1 Japanese Patent Application Laid-Open ( JP-A) No. 2008-246507
  • an object of the present invention is to provide a shielded metal arc welding rod which is inexpensive and with which a weld metal having excellent low-temperature toughness can be obtained and the amount of fumes generated can be reduced, and a method of manufacturing a welded joint using the shielded metal arc welding rod.
  • Means for solving the problems includes the following aspects.
  • a shielded metal arc welding rod which is inexpensive and with which a weld metal having excellent low-temperature toughness can be obtained and the amount of fumes generated can be reduced, and a method of manufacturing a welded joint using the shielded metal arc welding rod.
  • a numerical range that has been indicated by use of "to” in a case in which "more than” and “less than” are not attached to numerical values which are described before and after “to” means a range including these numerical values as a lower limit value and an upper limit value.
  • a numerical range in a case in which "more than” or “less than” is attached to the numerical values which are described before and after “to” means a range not including these numerical values as the lower limit value or the upper limit value.
  • an upper limit value in one stepwise numerical range may be replaced with an upper limit value in another numerical range described in a stepwise manner, or may be replaced with a value shown in Examples.
  • a lower limit value in one stepwise numerical range may be replaced with a lower limit value in another numerical range described in a stepwise manner, or may be replaced with a value shown in Examples.
  • % means “% by mass”.
  • a shielded metal arc welding rod according to the disclosure (hereinafter, simply referred to as "welding rod” in some cases) includes a core wire made of steel and a flux coating the core wire.
  • a chemical component of the core wire has a predetermined composition.
  • the shielded metal arc welding rod according to the disclosure is a welding rod which is inexpensive and with which a weld metal having excellent low-temperature toughness can be obtained and the amount of fumes generated can be reduced.
  • the shielded metal arc welding rod according to the disclosure has been found from the following findings.
  • the inventors have studied a technique for obtaining a welding rod in which the low-temperature toughness of the weld metal is improved and the amount of fumes generated can be reduced even when the Ni content is reduced and the Mn content is increased. As a result, the following findings were obtained.
  • the fume is an object obtained by releasing metal vapor generated from the melt pool into the air by arc force and solidifying the metal vapor.
  • the arc force varies depending not only on the welding conditions but also on the components of the core wire. Specifically, by controlling the contents of Ni and Mn contained in the core wire and functioning as austenite stabilizing elements, the Ni content in the entire welding rod is reduced, and even when the Mn content is increased, the arc force is relaxed, a weld metal having excellent low-temperature toughness can be obtained, and the amount of fumes generated can also be reduced.
  • the shielded metal arc welding rod according to the disclosure is a welding rod which is inexpensive and with which a weld metal having excellent low-temperature toughness can be obtained and the amount of fumes generated can be reduced.
  • the inventors have studied a metal carbonate, an oxide, Mn, and Ni in the flux, and as a result, have found that the low-temperature toughness is further improved by controlling the amounts thereof.
  • the shielded metal arc welding rod according to the disclosure preferably contains an oxide, Mn, and Ni in predetermined amounts, thereby obtaining a welding rod which is inexpensive and with which a weld metal having more excellent low-temperature toughness can be obtained and the amount of fumes generated can be reduced.
  • % means “by mass% with respect to the total mass of the chemical components of the core wire” unless otherwise specified.
  • the chemical component of the core wire consists of
  • C is an element that generates spatters. For reducing spatters, the lower the C content of the core wire is, the more advantageous it is. C is also an interstitial solid solution strengthening element. When the C content of the core wire is excessive, the core wire becomes hard, and core wire processing becomes difficult. Spatters also increase.
  • the C content of the core wire is set to from 0% to 0.650%.
  • the C removal cost increases.
  • the C content of the welding rod is insufficient and the strength of the weld metal is insufficient. Therefore, when the C content of the core wire is low, the C content of the flux needs to be increased. Therefore, the lower limit of the C content of the core wire may be set to 0.003%, 0.005%, or 0.008%.
  • the upper limit of the C content in the core wire is preferably 0.600%, 0.500%, 0.400%, 0.300%, 0.200%, less than 0.200%, 0.190%, 0.180%, 0.150%, or 0.120%.
  • Si is a deoxidizing element.
  • the Si content of the core wire is too low, the P content of the core wire increases.
  • Si has low solid solubility relative to an austenite phase, and as the Si content becomes more increased, a brittle phase, such as an intermetallic compound and ⁇ ferrite, is more likely to be generated at a high temperature, which deteriorates high-temperature ductility.
  • the Si content of the core wire is set to from 0.03% to 0.50%.
  • the lower limit of the Si content of the core wire is preferably 0.04%, 0.05%, or 0.08%.
  • the upper limit of the Si content of the core wire is preferably less than 0.50%, 0.48%, 0.45%, 0.40%, 0.35%, 0.30%, or 0.20%.
  • Mn is an element that causes an increase in the amount of fumes generated.
  • the lower Mn content of the core wire is, the more advantageous it is.
  • Mn is excessively added, the stacking fault energy decreases and the toughness deteriorates.
  • Mn is an austenite stabilizing element.
  • the Mn content of the core wire is too low, the Mn content of the entire welding rod is insufficient, austenitization of the weld metal hardly proceeds, and the low-temperature toughness is deteriorated. It is necessary to excessively increase the Mn content of the flux in order to secure the low-temperature toughness of the weld metal.
  • the Mn content of the core wire is set to from 2.1% to 30.0%.
  • the lower limit of the Mn content of the core wire is preferably 3.0%, 5.0%, more than 5.0%, 5.2%, more than 6.0%, 6.2%, 7.0%, more than 7.0%, 7.2%, more than 10.0%, or 10.2%.
  • the upper limit of the Mn content of the core wire is preferably 25.0%, 20.0%, 19.0%, 18.0%, 15.0%, or 12.0%.
  • the lower limit of the P content of the core wire is set to 0%.
  • the P content of the core wire may be 0.003% or more.
  • the P content of the core wire is set to from 0% to 0.050%.
  • the P content of the core wire is preferably 0.040% or less, 0.030% or less, 0.020% or less, 0.015% or less, or 0.010% or less.
  • the S content of the core wire is set to 0%.
  • the S content of the core wire may be 0.003% or more.
  • the S content of the core wire is set to from 0% to 0.050%.
  • the S content of the core wire is preferably 0.040% or less, 0.030% or less, 0.020% or less, 0.015% or less, or 0.010% or less.
  • Cu is a precipitation strengthening element and may be contained in the core wire in order to improve the strength of the weld metal.
  • the Cu content of the core wire is excessive, the above effect is saturated.
  • the core wire becomes hard, and core wire processing becomes difficult.
  • the Cu content of the core wire is set to from 0% to 5.0%.
  • the lower limit of the Cu content of the core wire is preferably 0.3%, 0.5%, or 0.7%.
  • the upper limit of the Cu content of the core wire is preferably 4.5%, 4.0%, or 3.5%.
  • Ni is an austenite stabilizing element.
  • the Ni content of the core wire is too low, the Ni content of the entire welding rod is insufficient, austenitization of the weld metal hardly proceeds, and the low-temperature toughness is deteriorated. It is necessary to excessively increase the Ni content of the flux in order to secure the low-temperature toughness of the weld metal.
  • the Ni content of the core wire is set to from 1.0% to 30.0%.
  • the lower limit of the Ni content of the core wire is preferably 2.0%, 3.0%, 5.0%, more than 6.0%, 6.2%, 7.0%, more than 8.0%, or 8.2%.
  • the upper limit of the Ni content of the core wire is preferably 28.0%, 26.0%, 24.0%, 22.0%, 20.0%, 19.0%, 18.0%, 15.0%, or 12.0%.
  • Cr is an austenite stabilizing element and may be contained in the core wire in order to improve the low-temperature toughness of the weld metal.
  • the Cr content of the core wire is set to from 0% to 10.0%.
  • the lower limit of the Cr content of the core wire is preferably 0.01%, 0.02%, 1.0%, 2.0%, or 3.0%.
  • the upper limit of the Cr content of the core wire is preferably 9.0%, 8.0%, less than 8.0%, 7.8%, 7.0%, less than 6.0%, or 5.8%.
  • Mo is a precipitation strengthening element and may be contained in the core wire in order to improve the strength of the weld metal.
  • Mo content of the core wire When the Mo content of the core wire is excessive, the core wire becomes hard, and core wire processing becomes difficult.
  • Mo content of the core wire When the Mo content of the core wire is excessive, the strength of the weld metal becomes excessive, and the low-temperature toughness is decreased.
  • the Mo content of the core wire is set to from 0% to 10.0%.
  • the lower limit of the Mo content of the core wire is preferably 1.0%, 2.0%, or 3.0%.
  • the upper limit of the Mo content of the core wire is preferably 9.0%, 8.0%, or 7.0%.
  • Nb is an element that forms a carbide in the weld metal and increases the sheath of the weld metal, and thus may be contained in the core wire.
  • the Nb content of the core wire is set to from 0% to 1.00%.
  • the lower limit of the Nb content of the core wire is preferably 0.01%, 0.05%, 0.10%, 0.15%, or 0.20%.
  • the upper limit of the Nb content of the core wire is preferably 0.95%, 0.90%, 0.85%, or 0.80%.
  • V is an element that forms a carbonitride in the weld metal and increases the sheath of the weld metal, and thus may be contained in the core wire.
  • the V content of the core wire is set to from 0% to 1.00%.
  • the lower limit of the V content of the core wire is preferably 0.01%, 0.05%, 0.10%, 0.15%, or 0.20%.
  • the upper limit of the V content of the core wire is preferably 0.95%, 0.90%, 0.85%, or 0.80%.
  • Co is an element that increases the strength of the weld metal by solid solution strengthening, Co may be contained in the core wire.
  • the core wire becomes hard, and core wire processing becomes difficult.
  • the Co content of the core wire is excessive, the ductility of the weld metal is decreased, and the toughness cannot be secured.
  • the Co content of the core wire is set to from 0% to 1.00%.
  • the lower limit of the Co content of the core wire is preferably 0.01%, 0.05%, 0.10%, 0.15%, or 0.20%.
  • the upper limit of the Co content of the core wire is preferably 0.95%, 0.90%, 0.85%, or 0.80%.
  • Pb has an effect of improving the toe moldability between the steel material as a base material and the weld metal to improve the machinability of the weld metal, Pb may be contained in the core wire.
  • the Pb content of the core wire is set to from 0% to 1.00%.
  • the lower limit of the Pb content of the core wire is preferably 0.01%, 0.05%, 0.10%, 0.15%, or 0.20%.
  • the upper limit of the Pb content of the core wire is preferably 0.95%, 0.90%, 0.85%, or 0.80%.
  • Sn is an element that improves the corrosion resistance of the weld metal
  • Sn may be contained in the core wire.
  • the Sn content of the core wire is set to from 0% to 1.00%.
  • the lower limit of the Sn content of the core wire is preferably 0.01%, 0.05%, 0.10%, 0.15%, or 0.20%.
  • the upper limit of the Sn content of the core wire is preferably 0.95%, 0.90%, 0.85%, or 0.80%.
  • Al is a deoxidizing element and may be contained in the core wire in order to suppress welding defects and improve the cleanliness of the weld metal.
  • Al content of the core wire is excessive, coarse inclusions are generated in the core wire, and core wire processing becomes difficult.
  • Al content of the core wire is excessive, Al may form a nitride or an oxide in the weld metal to decrease the low-temperature toughness of the weld metal.
  • the Al content of the core wire is set to from 0% to 0.10%.
  • the lower limit of the Al content of the core wire is preferably 0.01%, 0.02%, or 0.03%.
  • the upper limit of the Al content of the core wire is preferably 0.09%, 0.08%, or 0.07%.
  • Ti is a deoxidizing element and may be contained in the core wire in order to suppress welding defects and improve the cleanliness of the weld metal.
  • the Ti content of the core wire is set to from 0% to 0.10%.
  • the lower limit of the Ti content of the core wire is preferably 0.003%, 0.01%, 0.02%, or 0.03%.
  • the upper limit of the Ti content of the core wire is preferably 0.09%, 0.08%, or 0.07%.
  • B is an austenite stabilizing element and is also an interstitial solid solution strengthening element, and may be contained in the core wire in order to improve the low-temperature toughness and strength of the weld metal.
  • the B content of the core wire is set to from 0% to 0.1000%.
  • the lower limit of the B content of the core wire is preferably 0.0005%, 0.0010%, or 0.0020%.
  • the upper limit of the B content of the core wire is preferably 0.0800%, 0.0500%, or 0.0100%.
  • N is an austenite stabilizing element and is also an interstitial solid solution strengthening element, and may be contained in the core wire in order to improve the low-temperature toughness and strength of the weld metal.
  • the N content of the core wire is set to from 0% to 0.5000%.
  • the lower limit of the N content of the core wire is preferably 0.0010%, 0.0100%, or 0.0500%.
  • the upper limit of the N content of the core wire is preferably 0.4500%, 0.4000%, or 0.3500%.
  • O may be contained in the core wire as an impurity.
  • the O content is excessive, toughness and ductility in the weld metal are deteriorated, and thus the upper limit of the O content of the core wire is set to 0.0050% or less.
  • the upper limit of the O content of the core wire is preferably 0.0040% or 0.0030%.
  • the lower limit of the O content of the core wire is preferably 0.0003% or 0.0005%.
  • the impurities mean raw materials such as minerals or scraps or components to be incorporated by various factors of a manufacturing process when the core wire is industrially manufactured, which are acceptable within a range not adversely affecting the characteristics of the welding rod.
  • Each of Mn and Ni is an austenite stabilizing element and improve the low-temperature toughness of the weld metal. Since Ni is an expensive metal, in order to improve the low-temperature toughness of the weld metal while suppressing the cost of the welding rod, the total (Mn + Ni) of the Mn content and the Ni content is set to 5.0% or more while each of the Mn content and the Ni content in the core wire satisfies the above range.
  • the total (Mn + Ni) of the Mn content and the Ni content in the core wire is preferably 7.0% or more, 10.0% or more, or 15.0% or more.
  • the total (Mn + Ni) of the Mn content and the Ni content is preferably set to 37.0% or less while each of the Mn content and the Ni content in the core wire satisfies the above range.
  • the total (Mn + Ni) of the Mn content and the Ni content in the core wire is more preferably 35.0% or less, 32.0% or less, or 30.0% or less.
  • Mn, Ni, and Cr are austenite stabilizing elements and improve the low-temperature toughness of the weld metal. Since Ni is an expensive metal, in order to improve the low-temperature toughness of the weld metal while suppressing the cost of the welding rod, the total (Mn + Ni + Cr) of the Mn content, the Ni content, and the Cr content is set to 15.0% or more while each of the Mn content, the Ni content, and the Cr content in the core wire satisfies the above range.
  • the total (Mn + Ni + Cr) of the Mn content, the Ni content, and the Cr content in the core wire is preferably 17.0% or more, 19.0% or more, 20.0% or more, 22.0% or more, 24.0% or more, 26.0% or more, 28.0% or more, or 30.0% or more.
  • Mn is an element that causes an increase in the amount of fumes generated. When Mn is excessively added, the stacking fault energy decreases and the toughness deteriorates.
  • Cr is an element that forms a martensite structure, and affects the processability of the core wire. Cr causes an increase in the amount of a low-melting-point compound in the molten metal.
  • the total (Mn + Ni + Cr) of the Mn content, the Ni content, and the Cr content is preferably set to 47.0% or less while each of the Mn content, the Ni content, and the Cr content in the core wire satisfies the above range.
  • the total (Mn + Ni + Cr) of the Mn content, the Ni content, and the Cr content in the core wire is more preferably 45.0% or less, 42.0% or less, or 40.0% or less.
  • Mn and Ni are austenite stabilizing elements and improve the low-temperature toughness of the weld metal.
  • Ni is an expensive metal
  • Mn is an element that causes an increase in the amount of fumes generated.
  • Mn is excessively added, the stacking fault energy decreases and the toughness deteriorates.
  • Ni improves the toughness by increasing the stacking fault energy.
  • the mass ratio (Ni/Mn) of the Mn content and the Ni content in the core wire is preferably set to 0.10 or more.
  • the lower limit of the mass ratio (Ni/Mn) of the Mn content and the Ni content in the core wire is more preferably 0.20, 0.30, 0.50, 0.70, 1.00, 1.10, or 1.20.
  • the upper limit of the mass ratio (Ni/Mn) of the Mn content and the Ni content in the core wire is preferably 10.00, 8.00, or 5.00.
  • the fraction of fcc in the core wire is set to 70% or more.
  • the fraction of fcc is preferably 80% or more or 90% or more, and may be 100%.
  • the remainder of the structure is bcc.
  • the fraction of fcc in the structure of the core wire can be determined by the following method.
  • a sample is collected from the core wire, the fraction (%) of bcc on the sample surface is measured by a magnetic induction method using FERITSCOPE (registered trademark) FMP30 (manufactured by FISCHER INSTRUMENTS K.K.) and using a probe (FGAB 1.3-Fe) manufactured by FISCHER INSTRUMENTS K.K. as a probe of the measuring instrument, and the arithmetic average value of the measured fractions of bcc is determined.
  • the chemical component of the flux according to the disclosure preferably includes
  • the Ti oxide is a slag component and has an action of uniformly encapsulating the entire bead with the slag.
  • the Ti oxide has an effect of stabilizing the duration of the arc and reducing the amount of spatters generated, and welding workability (particularly, vertical weldability) is improved. Therefore, the Ti oxide may be contained.
  • a sum of the total of TiO 2 -equivalent values of the Ti oxide and the total of SiO 2 -equivalent values of the Si oxide is preferably 5.00% or more, that is, only one of the Ti oxide or the Si oxide may be contained. Therefore, the lower limit of TiO 2 -equivalent values of the Ti oxide may be 0%.
  • the total of TiO 2 -equivalent values of the Ti oxide is 25.00% or less, the amount of oxygen in the weld metal can be suppressed, and the low-temperature toughness can be secured.
  • the total of TiO 2 -equivalent values of the Ti oxide is 25.00% or less, an increase in viscosity of the slag can be suppressed, and thus, it is possible to suppress the slag from becoming too thick, and to suppress a shape in which the toe of the bead is expanded.
  • the total of TiO 2 -equivalent values of the Ti oxide is 25.00% or less, the formation of pits can be suppressed. The occurrence of slag entrainment can be suppressed.
  • the total of TiO 2 -equivalent values of the Ti oxide in the flux is preferably set to from 0% to 25.00%.
  • the lower limit of the total of TiO 2 -equivalent values of the Ti oxide is more preferably 1.00%, 2.00%, 3.00%, or 5.00%.
  • the upper limit of the total of TiO 2 -equivalent values of the Ti oxide is more preferably 23.00%, 20.00%, 18.00%, 15.00%, 13.00%, or 10.00%.
  • the Ti oxide may mainly exist as rutile, titanium oxide, titanium slag, ilmenite, sodium titanate, potassium titanate, or the like in the flux. Therefore, mainly by controlling the content of the Ti oxide in the flux, the content of the Ti oxide can be adjusted to the above range.
  • the total of TiO 2 -equivalent values of the Ti oxide is the mass percentage of TiO 2 with respect to the total mass of the welding rod in a case in which all the Ti oxides (for example, TiO, TiO 2 , Ti 2 O 3 , Ti 3 O 5 , and the like are used, and the Ti oxides are added as rutile, titanium oxide, titanium slag, ilmenite, sodium titanate, potassium titanate, or the like) contained in the flux are converted into TiO 2 .
  • all the Ti oxides for example, TiO, TiO 2 , Ti 2 O 3 , Ti 3 O 5 , and the like are used, and the Ti oxides are added as rutile, titanium oxide, titanium slag, ilmenite, sodium titanate, potassium titanate, or the like
  • the total of TiO 2 -equivalent values of the Ti oxide is determined by analyzing the mass of Ti existing as an oxide in the flux using a fluorescent X-ray analyzer and an X-ray diffraction (XRD) apparatus.
  • the amount of Ti existing as an oxide in the flux and the amount of Ti contained as a metal component can be determined separately by analyzing components contained in the flux by fluorescent X-ray analysis and then analyzing the molecular structure of the components contained by X-ray diffraction (XRD).
  • a flux is collected from the welding rod and is analyzed by the above method.
  • the mass percentages of the Ti oxides are represented as [TiO 2 ], [Ti 2 O 3 ], and [Ti 3 O 5 ], respectively, and the total of TiO 2 -equivalent values of the Ti oxide is represented as [converted TiO 2 ], which is calculated by the following Formula 1.
  • Converted TiO 2 0.60 ⁇ TiO 2 + 0.67 ⁇ Ti 2 O 3 + 0.64 ⁇ Ti 3 O 5 ⁇ 1.67
  • the coefficients (0.60, 0.67, and 0.64) in Formula 1 are coefficients for calculating the amount of Ti contained in each oxide, and the multiplier (1.67) at the end is a multiplier for calculating a TiO 2 -equivalent value from the total amount of Ti existing as an oxide in the flux.
  • the multiplier for conversion into M a O b (example; TiO 2 ) is calculated by the following Formula 3. ([Atomic weight of element M] ⁇ a + [Atomic weight of oxygen] ⁇ b)/([Atomic weight of element M] ⁇ a) ... Formula 3 1.67 in Formula 1 corresponds to the multiplier determined by the above Formula 3.
  • the oxide may be considered to be a compound bonded to two kinds of metal elements.
  • the coefficient is calculated by the following Formula 4.
  • the total of SiO 2 -equivalent values of the Si oxide, the total of ZrO 2 -equivalent values of the Zr oxide, the total of Al 2 O 3 -equivalent values of the Al oxide, the total of MgO-equivalent values of the Mg oxide, the total of CaO-equivalent values of the Ca oxide, the total of Na 2 O-equivalent values of the Na oxide, the total of K 2 O-equivalent values of the K oxide, the total of MnO 2 -equivalent values of the Mn oxide, and the total of FeO-equivalent values of the Fe oxide can also be obtained by calculation similar to the total of the TiO 2 -equivalent values of the Ti oxide.
  • the Si oxide is a slag component and has an action of increasing the viscosity of molten slag and improving slag removability
  • the Si oxide may be contained from such a viewpoint.
  • a sum of the total of TiO 2 -equivalent values of the Ti oxide and the total of SiO 2 -equivalent values of the Si oxide is preferably 5.00% or more, that is, only one of the Ti oxide or the Si oxide may be contained. Therefore, the lower limit of SiO 2 -equivalent values of the Si oxide may be 0%.
  • the slag encapsulation state is further improved, the slag removability is enhanced, and the bead shape and the bead appearance can be further improved.
  • Welding workability (particularly, vertical weldability) can be secured.
  • the total of SiO 2 -equivalent values of the Si oxide is 25.00% or less, the amount of oxygen in the weld metal can be suppressed, and the low-temperature toughness can be secured.
  • the total of SiO 2 -equivalent values of the Si oxide is 25.00% or less, the amount of spatters generated can be suppressed.
  • the total of SiO 2 -equivalent values of the Si oxide is 25.00% or less, the formation of pits, gas grooves, and the like can be suppressed. The occurrence of slag entrainment can be suppressed.
  • the total of SiO 2 -equivalent values of the Si oxide in the flux is preferably set to from 0% to 25.00%.
  • the lower limit of the total of SiO 2 -equivalent values of the Si oxide is more preferably 0.05%, 0.10%, 0.15%, 0.20%, or 0.25%.
  • the upper limit of the total of SiO 2 -equivalent values of the Si oxide is more preferably 23.00%, 20.00%, 18.00%, 15.00%, 13.00%, or 10.00%.
  • the Si oxide may mainly exist as silica sand, zircon sand, feldspar, sodium silicate, potassium silicate, or the like in the flux.
  • the Ti oxide and the Si oxide are slag components, and from the viewpoint of making the encapsulated state of the slag favorable and the viewpoint of welding workability, at least one of the Ti oxide or the Si oxide is preferably contained.
  • the sum of the total of TiO 2 -equivalent values of the Ti oxide and the total of SiO 2 -equivalent values of the Si oxide in the flux is preferably set to 5.0% or more.
  • the lower limit of the sum of the total of TiO 2 -equivalent values of the Ti oxide and the total of SiO 2 -equivalent values of the Si oxide in the flux is more preferably 7.0% or 10.0%.
  • the upper limit of the sum of the total of TiO 2 -equivalent values of the Ti oxide and the total of SiO 2 -equivalent values of the Si oxide in the flux is preferably 50.0%, 45.0%, 40.0%, 35.0%, or 30.0%.
  • the Zr oxide increases the amount of oxygen in the weld metal and deteriorates the low-temperature toughness. Therefore, from the viewpoint of the low-temperature toughness, it is preferable not to contain a Zr oxide, and the lower limit of the total of ZrO 2 -equivalent values of the Zr oxide is set to 0%.
  • the Zr oxide is a slag component and has an action of enhancing slag encapsulation in horizontal fillet welding to smooth the bead shape
  • the Zr oxide may be contained from such a viewpoint.
  • the total of ZrO 2 -equivalent values of the Zr oxide in the flux is preferably set to from 0% to 5.00%.
  • the upper limit of the total of ZrO 2 -equivalent values of the Zr oxide is more preferably 4.50%, 4.00%, 3.50%, or 3.00%.
  • the Zr oxide may mainly exist as zircon sand, zirconium oxide, or the like in the flux, and may be contained in a trace amount in the Ti oxide.
  • the Al oxide serves as an oxygen source, when the Al oxide is added, the amount of oxygen in the weld metal, which causes toughness deterioration. Therefore, from the viewpoint of the low-temperature toughness, it is preferable not to contain an Al oxide, and the lower limit of the total of Al 2 O 3 -equivalent values of the Al oxide is set to 0%.
  • the Al oxide has an action of preventing undercut on the upper leg side of the fillet bead by improving slag encapsulation, and thus may be contained from such a viewpoint.
  • the bead shape in which the toe of the bead on the lower leg side of the fillet bead is expanded can be suppressed.
  • the occurrence of slag entrainment can be suppressed.
  • the total of Al 2 O 3 -equivalent values of the Al oxide in the flux is preferably set to from 0% to 5.00%.
  • the upper limit of the total of Al 2 O 3 -equivalent values of the Al oxide is more preferably 4.50%, 4.00%, 3.50%, or 3.00%.
  • the Al oxide may mainly exist as a component such as alumina or feldspar in the flux in many cases.
  • the Mg oxide is decomposed during welding, and decomposed Mg acts as a deoxidizing agent to reduce the amount of oxygen in the weld metal. Thereby, the low-temperature toughness of the weld metal is improved, and thus such an oxide may be contained.
  • the total of MgO-equivalent values of the Mg oxide is 0.10% or more, an action of reducing the amount of oxygen in the weld metal is increased, and the low-temperature toughness is further improved.
  • the total of MgO-equivalent values of the Mg oxide is 5.00% or less, the lowering of the solidification temperature of the welding slag can be suppressed, and welding workability (particularly, vertical weldability) can be improved.
  • the total of MgO-equivalent values of the Mg oxide in the flux is preferably set to from 0% to 5.00%.
  • the lower limit of the total of MgO-equivalent values of the Mg oxide is more preferably 0.10%, 0.20%, 0.30%, or 0.40%.
  • the upper limit of the total of MgO-equivalent values of the Mg oxide is more preferably 4.50%, 4.00%, 3.50%, or 3.00%.
  • the Ca oxide adjusts a slag shape, facilitates slag removal after welding, and stabilizes an arc, the Ca oxide may be contained.
  • the total of CaO 2 -equivalent values of the Ca oxide in the flux is preferably set to from 0% to 25.00%.
  • the lower limit of the total of CaOz-equivalent values of the Ca oxide is more preferably 0.10%, 0.20%, 0.30%, or 0.40%.
  • the upper limit of the total of CaOz-equivalent values of the Ca oxide is more preferably 23.00%, 20.00%, 18.00%, 15.00%, 13.00%, or 10.00%.
  • the Na oxide is decomposed during welding, and decomposed Na acts as a deoxidizing agent to reduce the amount of oxygen in the weld metal.
  • the low-temperature toughness of the weld metal is improved, and thus such an oxide may be contained.
  • the total of Na 2 O-equivalent values of the Na oxide is 0.10% or more, an action of reducing the amount of oxygen in the weld metal is increased, and the low-temperature toughness is further improved.
  • the total of Na 2 O-equivalent values of the Na oxide is 5.00% or less, the lowering of the solidification temperature of the welding slag can be suppressed, and welding workability (particularly, vertical weldability) can be improved.
  • the total of Na 2 O-equivalent values of the Na oxide in the flux is preferably set to from 0% to 5.00%.
  • the lower limit of the total of Na 2 O-equivalent values of the Na oxide is more preferably 0.10%, 0.20%, 0.30%, or 0.40%.
  • the upper limit of the total of Na 2 O-equivalent values of the Na oxide is more preferably 4.50%, 4.00%, 3.50%, or 3.00%.
  • the K oxide is decomposed during welding, and decomposed K acts as a deoxidizing agent to reduce the amount of oxygen in the weld metal.
  • the low-temperature toughness of the weld metal is improved, and thus such an oxide may be contained.
  • the total of K 2 O-equivalent values of the K oxide is 0.10% or more, an action of reducing the amount of oxygen in the weld metal is increased, and the low-temperature toughness is further improved.
  • the total of K 2 O-equivalent values of the K oxide is 5.00% or less, the lowering of the solidification temperature of the welding slag can be suppressed, and welding workability (particularly, vertical weldability) can be improved.
  • the total of K 2 O-equivalent values of the K oxide in the flux is preferably set to from 0% to 5.00%.
  • the lower limit of the total of K 2 O-equivalent values of the K oxide is more preferably 0.10%, 0.20%, 0.30%, or 0.40%.
  • the upper limit of the total of K 2 O-equivalent values of the K oxide is more preferably 4.50%, 4.00%, 3.50%, or 3.00%.
  • the flux according to the disclosure may contain, for example, oxides such as a Fe oxide and a Mn oxide as other oxides.
  • the content of the Fe oxide means the total of FeO-equivalent values of the Fe oxide
  • the content of the Mn oxide means the total of MnO-equivalent values of the Mn oxide.
  • CaF 2 has an effect of reducing the amount of oxygen in the weld metal
  • CaF 2 may be contained.
  • the content of CaF 2 is 0.10% or more, an action of reducing the amount of oxygen in the weld metal is increased, and the low-temperature toughness is further improved.
  • the CaF 2 content in the flux is preferably set to 0% to 30.00%.
  • the lower limit of the CaF 2 content is more preferably 0.10%, 0.20%, 0.30%, or 0.40%.
  • the upper limit of the CaF 2 content is more preferably 28.00%, 25.00%, 23.00%, 20.00%, 18.00%, or 15.00%.
  • the flux according to the disclosure may contain, for example, fluorides such as K 2 SiF 6 , K 2 ZrF 6 , NaF, Na 3 AlF 6 , and MgF 2 as other fluorides.
  • the contents of CaF 2 and the other fluorides are measured by fluorescent X-ray analysis and X-ray diffraction (XRD) similarly to the content of the Ti oxide described above.
  • the metal carbonate is ionized by an arc to generate CO 2 gas.
  • the CO 2 gas lowers the hydrogen partial pressure in a welding atmosphere and reduces the diffusible hydrogen amount in the weld metal. Therefore, the flux according to the disclosure may contain one or two or more selected from the group consisting of CaCO 3 , BaCO 3 , MgCO 3 , and Li 2 CO 3 , and a metal carbonate.
  • the amount of spatters generated can be suppressed.
  • the CaCO 3 content in the flux is preferably set to 0% to 60.00%.
  • the lower limit of the CaCO 3 content is more preferably 0.10%, 0.20%, 0.30%, or 0.40%.
  • the upper limit of the CaCO 3 content is more preferably 55.00%, 50.00%, 45.00%, 40.00%, 35.00%, or 30.00%.
  • the BaCO 3 content in the flux is preferably set to 0% to 15.00%.
  • the lower limit of the BaCO 3 content is more preferably 0.10%, 0.20%, 0.30%, or 0.40%.
  • the upper limit of the BaCO 3 content is more preferably 14.00%, 12.00%, 10.00%, 8.00%, 7.00%, or 5.00%.
  • the MgCO 3 content in the flux is preferably set to 0% to 15.00%.
  • the lower limit of the MgCO 3 content is more preferably 0.10%, 0.20%, 0.30%, or 0.40%.
  • the upper limit of the MgCO 3 content is more preferably 14.00%, 12.00%, 10.00%, 8.00%, 7.00%, or 5.00%.
  • the Li 2 CO 3 content in the flux is preferably set to 0% to 15.00%.
  • the lower limit of the Li 2 CO 3 content is more preferably 0.10%, 0.20%, 0.30%, or 0.40%.
  • the upper limit of the Li 2 CO 3 content is more preferably 14.00%, 12.00%, 10.00%, 8.00%, 7.00%, or 5.00%.
  • Total Content of CaCO 3 , BaCO 3 , MgCO 3 , and Li 2 CO 3 Is 5.00% or More
  • CaCO 3 , BaCO 3 , MgCO 3 , and Li 2 CO 3 are generation sources of shielding gas, and from the viewpoint of securing favorable mechanical properties, it is preferable to contain any one or more of CaCO 3 , BaCO 3 , MgCO 3 , and Li 2 CO 3 .
  • the total content of CaCO 3 , BaCO 3 , MgCO 3 , and Li 2 CO 3 in the flux is preferably set to 5.00% or more.
  • the lower limit of the total content of CaCO 3 , BaCO 3 , MgCO 3 , and Li 2 CO 3 in the flux is more preferably 7.00% or 10.00%.
  • the upper limit of the total content of CaCO 3 , BaCO 3 , MgCO 3 , and Li 2 CO 3 in the flux is preferably 90.00%, 80.00%, 70.00%, 65.00%, or 60.00%.
  • the flux according to the disclosure may contain, for example, metal carbonates such as Na 2 CO 3 , K 2 CO 3 , FeCO 3 , MnCO 3 , and SrCO 3 as other metal carbonates.
  • metal carbonates such as Na 2 CO 3 , K 2 CO 3 , FeCO 3 , MnCO 3 , and SrCO 3 as other metal carbonates.
  • the contents of CaCO 3 , BaCO 3 , MgCO 3 , Li 2 CO 3 , and the other metal carbonates are measured by fluorescent X-ray analysis and X-ray diffraction (XRD) similarly to the content of the Ti oxide described above.
  • a sum X (hereinafter, simply referred to as "sum X of the specific additives") of the total of TiO 2 -equivalent values of the Ti oxide, the total of SiO 2 -equivalent values of the Si oxide, the total of ZrO 2 -equivalent values of the Zr oxide, the total of Al 2 O 3 -equivalent values of the Al oxide, the total of MgO-equivalent values of the Mg oxide, the total of CaO-equivalent values of the Ca oxide, the total of Na 2 O-equivalent values of the Na oxide, the total of K 2 O-equivalent values of the K oxide, the CaF 2 content, the CaCO 3 content, the BaCO 3 content, the MgCO 3 content, and the Li 2 CO 3 content is preferably 94.98% or less.
  • the sum X of the specific additives is more preferably 90.00% or less, 85.00% or less, 80.00% or less, 75.00% or less, or 70.00%.
  • the flux according to the disclosure may further contain a nitride.
  • the nitride has a function of reducing the diffusible hydrogen amount in the weld metal to remarkably improve the low-temperature cracking resistance of the weld metal.
  • the reason for this is not clear, but it is presumed that one of the reasons is that N in the nitride is bonded to hydrogen (H) during welding to become ammonia (NH 3 ), and this NH 3 is released to the outside of the weld metal.
  • the flux according to the disclosure may contain, for example, one or two or more selected from the group consisting of AlN, BN, Ca 3 N 2 , CeN, CrN, C u3 N, Fe 4 N, Fe 3 N, Fe 2 N, Mg 3 N, Mo 2 N, NbN, Si 3 N 4 , TiN, VN, ZrN, Mn 2 N, and Mn 4 N, as a nitride.
  • the content of the nitride is measured by fluorescent X-ray analysis and X-ray diffraction (XRD) similarly to the content of the Ti oxide described above.
  • the metal component in a preferred chemical component of the flux according to the disclosure will be described.
  • % means “by mass% with respect to the total mass of the flux” unless otherwise specified.
  • the "metal component in the chemical component" of the flux means a component other than an oxide, a fluoride, a nitride, and a metal carbonate among components contained in the flux.
  • a metal component in the chemical component of the flux preferably consists of, by mass% with respect to the total mass of the shielded metal arc welding rod,
  • the component is a content of a component other than an oxide, a fluoride, a nitride, and a metal carbonate.
  • the total (Mn + Ni) of the Mn content and the Ni content in the flux is preferably 1.00% or more.
  • C is an element that improves the strength of the weld metal, and is an element for securing the strength of the weld metal.
  • the C content of the flux is preferably set to 0.020% to 5.000%.
  • the lower limit of the C content of the flux is more preferably 0.050%, 0.100%, or 0.200%.
  • the upper limit of the C content of the flux is more preferably 4.500%, 4.000%, 3.500%, or 3.000.
  • Si improves the cleanliness of the weld metal and suppresses the occurrence of welding defects such as blow holes, Si may be contained in the flux.
  • the Si content of the flux is preferably set to 0% to 5.00%.
  • the lower limit of the Si content of the flux is more preferably 0.10%, 0.20%, 0.25%, 0.30%, or 0.35%.
  • the upper limit of the Si content of the flux is more preferably 4.50%, 4.00%, 3.50%, or 3.00%.
  • Mn is an austenite stabilizing element, can cause austenitization of the weld metal to proceed, and can secure the low-temperature toughness. It is not necessary to excessively increase the content of the Mn to be added to the core wire in order to secure the low-temperature toughness of the weld metal.
  • Mn is an element that functions as a deoxidizing agent to improve the cleanliness of the weld metal.
  • Mn is an element that detoxifies S in the weld metal by forming MnS and improves the low-temperature toughness of the weld metal.
  • Mn also has an effect of preventing hot cracking. Therefore, Mn may be contained in the flux.
  • the total (Mn + Ni) of the Mn content and the Ni content is preferably 1.00% or more, that is, the flux may contain only one of Mn or Ni. Therefore, the lower limit of the Mn content may be 0%.
  • the Mn content of the flux is preferably set to 0% to 30.00%.
  • the lower limit of the Mn content of the flux is more preferably 0.10%, 0.50%, 1.00%, 2.00%, 5.00%, 7.00%, or 9.00%.
  • the upper limit of the Mn content of the flux is more preferably 28.00%, 25.00%, 22.00%, or 20.00%.
  • the P content of the flux is set to 0%.
  • the P content may be 0.003% or more.
  • the P content of the flux is preferably set to 0% to 0.050%.
  • the P content of the flux is more preferably 0.040% or less, 0.030% or less, 0.020% or less, 0.015% or less, or 0.010% or less.
  • the lower limit of the S content of the flux is set to 0%.
  • the S content of the flux may be 0.003% or more.
  • the S content of the flux is preferably set to 0% to 0.050%.
  • the S content of the flux is more preferably 0.040% or less, 0.030% or less, 0.020% or less, 0.015% or less, or 0.010% or less.
  • Cu is a precipitation strengthening element and may be contained in the flux in order to improve the strength of the weld metal.
  • Cu is an austenite stabilizing element and may be contained in the flux in order to improve the low-temperature toughness of the weld metal.
  • the Cu content of the flux is preferably set to 0% to 20.0%.
  • the lower limit of the Cu content of the flux is more preferably 0.5%, 0.7%, or 1.0%.
  • the upper limit of the Cu content of the flux is more preferably 19.0%, 18.0%, 17.0%, or 15.0%.
  • Ni is an austenite stabilizing element, can cause austenitization of the weld metal to proceed, and can secure the low-temperature toughness. It is not necessary to excessively increase the content of the Ni to be added to the core wire in order to secure the low-temperature toughness of the weld metal. Therefore, Ni may be contained in the flux.
  • the total (Mn + Ni) of the Mn content and the Ni content is preferably 1.00% or more, that is, the flux may contain only one of Mn or Ni. Therefore, the lower limit of the Ni content may be 0%.
  • the cost of the flux can be reduced.
  • the Ni content of the flux is preferably set to 0% to 20.0%.
  • the lower limit of the Ni content of the flux is more preferably 0.1%, 0.5%, 1.0%, 2.0%, 3.0%, 5.0%, 7.0%, 10.0%, or 12.0%.
  • the upper limit of the Ni content of the flux is more preferably 19.0%, 18.0%, 17.0%, or 15.0%.
  • Cr is an austenite stabilizing element, can cause austenitization of the weld metal to proceed, and can secure the low-temperature toughness. It is not necessary to excessively increase the content of the Ni to be added to the core wire in order to secure the low-temperature toughness of the weld metal. Therefore, Cr may be contained in the flux.
  • the amount of a low-melting-point compound in the molten metal can be reduced, and the solid-liquid coexisting temperature range of the molten metal is narrowed, so that the occurrence of hot cracking can be suppressed.
  • the Cr content of the flux is preferably set to 0% to 20.0%.
  • the lower limit of the Cr content of the flux is more preferably 0.1%, 0.5%, 1.0%, 2.0%, 2.5%, 3.0%, or 3.5%.
  • the upper limit of the Cr content of the flux is more preferably 19.0%, 18.0%, 17.0%, or 15.0%.
  • Mo is a solid-solution strengthening element and a precipitation strengthening element and may be contained in the flux in order to improve the strength of the weld metal.
  • the Mo content of the flux is preferably set to 0% to 10.0%.
  • the lower limit of the Mo content of the flux is more preferably 0.1%, 0.5%, 1.0%, 2.0%, 2.5%, 3.0%, or 3.5%.
  • the upper limit of the Mo content of the flux is more preferably 9.8%, 9.5%, 9.0%, 8.5%, or 8.0%.
  • Nb is an element that forms a carbide in the weld metal and increases the sheath of the weld metal, and thus may be contained in the flux.
  • the Nb content of the flux is preferably set to 0% to 5.00%.
  • the lower limit of the Nb content of the flux is more preferably 0.10%, 0.50%, 1.00%, or 1.50%.
  • the upper limit of the Nb content of the flux is more preferably 4.50%, 4.00%, or 3.50%.
  • V is an element that forms a carbonitride in the weld metal and increases the sheath of the weld metal, and thus may be contained in the flux.
  • the V content of the flux is preferably set to 0% to 5.0%.
  • the lower limit of the V content of the flux is more preferably 0.1%, 0.5%, 1.0%, or 1.5%.
  • the upper limit of the V content of the flux is more preferably 4.5%, 4.0%, or 3.5%.
  • Co is an element that increases the strength of the weld metal by solid solution strengthening, Co may be contained in the flux.
  • the Co content of the flux is preferably set to 0% to 1.00%.
  • the lower limit of the Co content of the flux is more preferably 0.01%, 0.05%, 0.10%, 0.15%, or 0.20%.
  • the upper limit of the Co content of the flux is more preferably 0.90%, 0.80%, 0.70%, 0.60%, or 0.30%.
  • Pb Since Pb has an effect of improving the machinability of the weld metal, Pb may be contained in the flux.
  • the arc state can be favorably maintained, and the occurrence of spatters can be suppressed.
  • the Pb content of the flux is preferably set to 0% to 1.00%.
  • the lower limit of the Pb content of the flux is more preferably 0.01%, 0.05%, 0.10%, 0.15%, or 0.20%.
  • the upper limit of the Pb content of the flux is more preferably 0.90%, 0.80%, 0.70%, 0.60%, or 0.30%.
  • Sn is an element that improves the corrosion resistance of the weld metal, Sn may be contained in the flux.
  • the Sn content of the flux is preferably set to 0% to 1.00%.
  • the lower limit of the Sn content of the flux is more preferably 0.01%, 0.05%, 0.10%, 0.15%, or 0.20%.
  • the upper limit of the Sn content of the flux is more preferably 0.90%, 0.80%, 0.70%, 0.60%, or 0.30%.
  • W is a solid-solution strengthening element and may be contained in the flux in order to improve the strength of the weld metal.
  • the W content of the flux is preferably set to 0% to 20.0%.
  • the lower limit of the W content of the flux is more preferably 0.1%, 0.5%, 1.0%, or 2.0%.
  • the upper limit of the W content of the flux is more preferably 19.0%, 180%, 17.0%, or 15.0%.
  • Mg is a deoxidizing element and is effective in reducing oxygen of the weld metal and improving the toughness of the weld metal, Mg may be contained in the flux.
  • the arc By reducing the Mg content of the flux, the arc can be stabilized, spatters and blow holes can be reduced, and welding workability can be secured.
  • the Mg content of the flux is preferably set to 0% to 5.00%.
  • the lower limit of the Mg content of the flux is more preferably 0.02%, 0.05%, 0.10%, 0.20%, or 0.50%.
  • the upper limit of the Mg content of the flux is more preferably 4.50%, 4.00%, or 3.50%.
  • Al is a deoxidizing element and is effective in suppressing the occurrence of welding defects such as blow holes, improving the cleanliness of the weld metal, and the like, Al may be contained in the flux.
  • the Al content of the flux is preferably set to 0% to 5.0%.
  • the lower limit of the Al content of the flux is more preferably 0.01%, 0.02%, 0.05%, 0.1%, 0.2%, or 0.5%.
  • the upper limit of the Al content of the flux is more preferably 4.5%, 4.0%, or 3.5%.
  • Ca has a function of changing the structure of a sulfide in the weld metal and refining the sizes of a sulfide and an oxide in the weld metal, Ca is effective in improving the ductility and toughness of the weld metal. Therefore, Ca may be contained in the flux.
  • the Ca content of the flux is preferably set to 0% to 5.00%.
  • the lower limit of the Ca content of the flux is more preferably 0.01%, 0.02%, 0.03%, 0.05%, 0.10%, 0.20%, 0.30%, or 0.50%.
  • the upper limit of the Ca content of the flux is more preferably 4.50%, 4.00%, or 3.50%.
  • Ti is a deoxidizing element and is effective in suppressing the occurrence of welding defects such as blow holes, improving the cleanliness, and the like, Ti may be contained in the flux.
  • the generation of a carbide in the weld metal can be suppressed, and the toughness of the weld metal can be secured.
  • the Ti content of the flux is preferably set to 0% to 5.000%.
  • the lower limit of the Ti content of the flux is more preferably 0.020%, 0.050%, 0.100%, 0.200%, 0.300%, or 0.500%.
  • the upper limit of the Ti content of the flux is more preferably 4.500%, 4.000%, or 3.500%.
  • B Since B has an effect of strengthening the crystal grain boundary of the weld metal and further increasing the tensile strength of the weld metal, B may be contained in the flux.
  • the amount of B in the weld metal can also be reduced, the formation of a B compound such as coarse BN or Fe 23 (C,B) 6 is suppressed, and the low-temperature toughness of the weld metal can be secured.
  • the B content of the flux is preferably set to 0% to 5.0000%.
  • the lower limit of the B content of the flux is more preferably 0.0010%, 0.0050%, 0.0100%, 0.0500%, 0.1000%, 0.2000%, or 0.5000%.
  • the upper limit of the B content of the flux is more preferably 4.5000%, 4.0000%, or 3.5000%.
  • REM is an element that stabilizes an arc
  • REM may be contained in the flux.
  • the REM content of the flux is preferably set to 0% to 5.00%.
  • the lower limit of the REM content of the flux is more preferably 0.001%, 0.005%, 0.01%, 0.05%, 0.10%, 0.20%, or 0.50%.
  • the upper limit of the REM content of the flux is more preferably 4.50%, 4.00%, or 3.50%.
  • REM represents total 17 elements including Sc, Y, and a lanthanoid
  • the "REM content” means the total content of these 17 elements.
  • REM is industrially contained in a form of a misch metal.
  • Bi is an element that improves the peelability of slag
  • Bi may be contained in the flux.
  • the Bi content of the flux is preferably set to 0% to 5.000%.
  • the lower limit of the Bi content of the flux is more preferably 0.005%, 0.010%, 0.050%, 0.100%, 0.200%, or 0.500%.
  • the upper limit of the Bi content of the flux is more preferably 4.500%, 4.000%, or 3.500%.
  • N is an austenite stabilizing element and is also an interstitial solid solution strengthening element.
  • N is an element that also has a smaller adverse effect on toughness of the weld metal due to an increase in strength of the weld metal than that of C. Therefore, N may be contained in the flux.
  • the occurrence of blowing can be reduced, and the occurrence of welding defects can be suppressed.
  • the N content of the flux is preferably set to 0% to 5.0000%.
  • the lower limit of the N content of the flux is more preferably 0.0050%, 0.0070%, 0.0100%, 0.0150%, 0.0200%, 0.0300%, 0.0500%, 0.0700%, 0.1000%, or 0.1500%.
  • the upper limit of the N content of the flux is more preferably 4.5000%, 4.0000%, or 3.5000%.
  • the impurities mean components derived from raw materials or components to be incorporated by various factors of a manufacturing process when the flux is industrially manufactured, which are acceptable within a range not adversely affecting the flux.
  • each of Mn and Ni is an austenite stabilizing element and improve the low-temperature toughness of the weld metal. Since Ni is an expensive metal, in order to improve the low-temperature toughness of the weld metal while suppressing the cost of the welding rod, the total (Mn + Ni) of the Mn content and the Ni content is preferably set to 1.00% or more while each of the Mn content and the Ni content in the flux satisfies the above range.
  • the total (Mn + Ni) of the Mn content and the Ni content in the flux is preferably 2.00% or more, 3.00% or more, or 5.00% or more.
  • Mn is an element that causes an increase in the amount of fumes generated.
  • the stacking fault energy decreases and the toughness deteriorates. Therefore, from the viewpoint of reducing the amount of fumes generated while suppressing the cost of the welding rod and improving the low-temperature toughness of the weld metal, the total (Mn + Ni) of the Mn content and the Ni content is preferably set to 50.00% or less while each of the Mn content and the Ni content in the flux satisfies the above range.
  • the total (Mn + Ni) of the Mn content and the Ni content in the flux wire is more preferably 45.00% or less, 40.00% or less, 35.00% or less, 32.00% or less, 30.00% or less, or 25.00% or less.
  • the shielded metal arc welding rod according to the disclosure may further include plating formed on the surface of the core wire.
  • the amount of hydrogen contained in the shielded metal arc welding rod according to the disclosure is not particularly limited, but is preferably 12 ppm or less with respect to the total mass of the shielded metal arc welding rod in order to reduce the diffusible hydrogen amount in the weld metal.
  • the amount of hydrogen in the shielded metal arc welding rod may increase due to entry of moisture into the shielded metal arc welding rod during storage of the shielded metal arc welding rod.
  • the diameter of the shielded metal arc welding rod according to the disclosure is not particularly limited, and is, for example, from ⁇ 3.2 mm to ⁇ 6.0 mm.
  • the diameter of a general shielded metal arc welding rod is from ⁇ 2.6 mm to ⁇ 7.0 mm.
  • the average thickness of the flux in the shielded metal arc welding rod according to the disclosure is not particularly limited.
  • the upper limit value of the average thickness of the flux in the shielded metal arc welding rod according to the disclosure may be set to, for example, 5.0 mm, 4.0 mm, or 3.0 mm.
  • the lower limit value of the average thickness of the flux in the shielded metal arc welding rod according to the disclosure may be set to, for example, 0.2 mm, 0.5 mm, 0.8 mm, or 1.0 mm.
  • the outer diameter of the shielded metal arc welding rod was measured at arbitrary five positions, a value of 1/2 of a value obtained by subtracting the diameter of the core wire from the outer diameter was calculated, and the arithmetic average value thereof was taken as the average thickness.
  • Flux thickness ((Diameter of outer diameter of shielded metal arc welding rod) - (Diameter of core wire))/2 is established.
  • a method of manufacturing a shielded metal arc welding rod according to the disclosure will be described.
  • the manufacturing method described below is an example, and the method of manufacturing a shielded metal arc welding rod according to the disclosure is not limited to the following method.
  • the shielded metal arc welding rod according to the disclosure can be manufactured through, for example, a step of preparing a core wire, a step of applying a flux to the core wire, and a step of firing the core wire and the flux.
  • step of preparing a core wire for example, steel having the above-described chemical component is first melted, and then forge processing is performed if necessary. Thereafter, the steel is processed into a rod shape through rolling. This rod-shaped steel is subjected to wire drawing to obtain a core wire. A heat treatment may be appropriately performed.
  • a flux is applied to the core wire, and then the core wire and the flux are fired.
  • the firing conditions are not particularly limited, but may be, for example, a firing temperature of from about 150°C to 450°C and a firing time of from about 0.1 hours to 3 hours.
  • a fixing agent for example, an aqueous solution of potassium silicate and sodium silicate may be added to the flux.
  • the method of manufacturing a welded joint according to the disclosure includes a step of welding a steel material by using the shielded metal arc welding rod according to the disclosure described above.
  • a welded joint manufactured by the method of manufacturing a welded joint according to the disclosure has a high strength and high toughness.
  • a welded structure having the welded joint manufactured by the method of manufacturing a welded joint according to the disclosure also has a high strength and high toughness in the welded joint.
  • gas shield arc welding is suitable as a welding method.
  • the type of steel material (a material to be welded) as a base material of the welded joint is not particularly limited, but for example, a Ni-based low temperature steel plate having a plate thickness of 20 mm or more and containing from 6% to 9% of Ni can be suitably used.
  • the method of manufacturing a welded joint according to the disclosure may include a step of welding a steel material by using the shielded metal arc welding rod according to the disclosure in any one or more of a first pass to the last pass. In a case in which the welding is performed only in a single pass, the shielded metal arc welding rod according to the disclosure is used in the single pass.
  • the polarity of the shielded metal arc welding rod may be either alternate current or direct current because the influence on the amount of spatters generated is negligibly small, but the polarity is preferably alternate current. In the case of direct current, the polarity of the rod is preferably positive.
  • the welding posture in the method of manufacturing a welded joint according to the disclosure is not particularly limited.
  • the method of manufacturing a welded joint according to the disclosure can exhibit favorable welding workability (particularly, vertical weldability) regardless of whether the welding posture is a downward posture, a lateral posture, an upright posture, or an upward posture.
  • a welded joint obtained by the method of manufacturing a welded joint according to the disclosure includes a steel material as a base material and a welded part including a weld metal and a weld heat affected zone.
  • the welded joint according to the disclosure is manufactured by using the shielded metal arc welding rod according to the disclosure, and includes a weld metal having a favorable bead shape. Therefore, a welded structure having the welded joint manufactured by the method of manufacturing a welded joint according to the disclosure also includes a weld metal having a favorable bead shape.
  • the tensile strength of the resulting weld metal is preferably high, for example, from 590 MPa to 1200 MPa.
  • the shielded metal arc welding rods of examples of the disclosure and comparative examples were manufactured by the method described below.
  • the flux having each chemical component shown in Tables 2-A, 2-B, 2-C, and 2-D was applied to the core wire having each chemical component shown in Tables 1-A and 1-B, and fired in a temperature range of from 300°C to 500°C for a range of from 1 hour to 3 hours to trial-produce a shielded metal arc welding rod.
  • the final welding rod diameter of the obtained shielded metal arc welding rod was ⁇ 6.0 mm, and the average thickness of the flux was 1.0 mm.
  • the configurations of these shielded metal arc welding rods are shown in Tables 1-A, 1-B, 2-A, 2-B, 2-C, and 2-D.
  • the unit of the content of the chemical component of the core wire shown in Tables 1-A, 1-B, 2-A, 2-B, 2-C, and 2-D is mass% with respect to the total mass of the core wire.
  • the units of the content of the chemical component of the flux, the content of the oxide, the content of the fluoride, the content of the metal carbonate, and the content of the iron powder are mass% with respect to the total mass of the flux.
  • mass% with respect to total mass of core wire and “Mass% with respect to total mass of flux” were both abbreviated as “mass%”
  • “Metal component in chemical component of flux” was abbreviated as "Chemical component of flux”.
  • TiO 2 represents a total of TiO 2 -equivalent values of a Ti oxide
  • SiO 2 represents a total of SiO 2 -equivalent values of a Si oxide
  • ZrO 2 represents a total of ZrO 2 -equivalent values of a Zr oxide
  • Al 2 O 3 represents a total of Al 2 O 3 -equivalent values of an Al oxide
  • MgO represents a total of MgO-equivalent values of a Mg oxide
  • CaO represents a total of CaO-equivalent values of a Ca oxide
  • Na 2 O represents a total of Na 2 O-equivalent values of a Na oxide
  • K 2 O represents a total of K 2 O-equivalent values of a K oxide.
  • the "sum X" shown in Table 2-D indicates a sum of the total of TiO 2 -equivalent values of the Ti oxide, the total of SiO 2 -equivalent values of the Si oxide, the total of ZrO 2 -equivalent values of the Zr oxide, the total of Al 2 O 3 -equivalent values of the Al oxide, the total of MgO-equivalent values of the Mg oxide, the total of CaO-equivalent values of the Ca oxide, the total of Na 2 O-equivalent values of the Na oxide, the total of K 2 O-equivalent values of the K oxide, the CaF 2 content, the CaCO 3 content, the BaCO 3 content, the MgCO 3 content, and the Li 2 CO 3 content.
  • Example of disclosure 3.98 0.5400 3.1 0.00 2 Example of disclosure 10.0 1.00 0.2149 0.00 3
  • Example of disclosure 3.98 0.1242 3.1 2.00 4
  • Example of disclosure 1.00 2.0000 10.80 10 Example of disclosure 0.043 0.0479 20.02 11
  • Example of disclosure 5.0 2.0 0.05 0.020 0.0325 5.1 22.04 16 Example of disclosure 0.60 9.0
  • the balance (that is, components other than the respective components shown in the table) of the core wire shown in Tables 1-A and 1-B and the balance (that is, components other than the respective components shown in the table) of the shielded metal arc welding rod shown in Tables 2-A, 2-B, 2-C, and 2-D are iron and impurities.
  • Evaluation was performed by performing gas shield arc welding by vertical upward welding using the shielded metal arc welding rods of examples of the disclosure and comparative examples. Specifically, evaluation was performed by the method described below.
  • the measurement of the amount of fumes generated by welding was performed by a total amount collection method using a high-volume air sampler in accordance with JIS Z3930:2013 (Determination of fume emission rate during arc welding).
  • a shielded metal arc welding rod having a fume amount of 1000 mg/min or less was rated as "passed” with respect to the amount of fumes, and a shielded metal arc welding rod having a fume amount of more than 1000 mg/min was rated as "failed”.
  • the steel plate was subjected to gas shield arc welding, and three impact test pieces (V-notch test pieces having a notch depth of 2 mm) were taken from the center of the weld metal in a plate thickness direction.
  • the three impact test pieces were subjected to a Charpy impact test in accordance with JIS Z2242:2005 at -196°C.
  • the shielded metal arc welding rod of the example of the disclosure has a small amount of fumes and is excellent in the low-temperature toughness of the resulting weld metal.
  • the comparative example did not satisfy any of the requirements specified in the disclosure, and thus failed in one or more evaluation items.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Nonmetallic Welding Materials (AREA)
EP22961043.1A 2022-09-30 2022-09-30 Verfahren zur herstellung eines beschichteten lichtbogenschweissstabes und einer schweissverbindung Pending EP4596166A4 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2022/036864 WO2024069984A1 (ja) 2022-09-30 2022-09-30 被覆アーク溶接棒及び溶接継手の製造方法

Publications (2)

Publication Number Publication Date
EP4596166A1 true EP4596166A1 (de) 2025-08-06
EP4596166A4 EP4596166A4 (de) 2025-12-03

Family

ID=90476699

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22961043.1A Pending EP4596166A4 (de) 2022-09-30 2022-09-30 Verfahren zur herstellung eines beschichteten lichtbogenschweissstabes und einer schweissverbindung

Country Status (7)

Country Link
US (1) US20250083263A1 (de)
EP (1) EP4596166A4 (de)
JP (1) JP7492185B1 (de)
KR (1) KR20240046707A (de)
CN (1) CN118119475A (de)
TW (1) TWI893466B (de)
WO (1) WO2024069984A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2025116039A1 (de) * 2023-12-01 2025-06-05
CN118808987B (zh) * 2024-09-14 2024-12-17 小米汽车科技有限公司 焊丝、激光拼焊结构件及其制备方法和车辆
CN119566619A (zh) * 2024-12-30 2025-03-07 江苏九桥新能源科技有限公司 一种超低温高锰钢用电弧焊焊条及其制备方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5126132B2 (de) * 1972-09-25 1976-08-04
JPS6037290A (ja) * 1983-08-08 1985-02-26 Nippon Steel Corp 低温用鋼の溶接用心線
JPH02205293A (ja) * 1989-02-02 1990-08-15 Nippon Steel Corp 極低温用ステンレス鋼被覆アーク溶接棒
JP5209893B2 (ja) 2007-03-29 2013-06-12 株式会社神戸製鋼所 Ｎｉ基合金フラックス入りワイヤ
JP7594173B2 (ja) * 2020-10-07 2024-12-04 日本製鉄株式会社 溶接継手の製造方法
CN113547254B (zh) * 2021-07-20 2022-09-06 武汉铁锚焊接材料股份有限公司 一种超低温高锰钢用电弧焊焊条

Also Published As

Publication number Publication date
EP4596166A4 (de) 2025-12-03
JPWO2024069984A1 (de) 2024-04-04
TW202423598A (zh) 2024-06-16
TWI893466B (zh) 2025-08-11
CN118119475A (zh) 2024-05-31
KR20240046707A (ko) 2024-04-09
WO2024069984A1 (ja) 2024-04-04
US20250083263A1 (en) 2025-03-13
JP7492185B1 (ja) 2024-05-29

Similar Documents

Publication Publication Date Title
EP4596166A1 (de) Verfahren zur herstellung eines beschichteten lichtbogenschweissstabes und einer schweissverbindung
EP2243591B1 (de) Schweissmaterial und geschweisste verbindungsstrukturen
KR101937553B1 (ko) 2상 스테인리스강용 아크 용접용 플럭스 코어드 와이어 및 용접 금속
JP5387192B2 (ja) ガスシールド溶接用フラックス入りワイヤ
EP3838474A1 (de) Massivdraht zum gas-metall-lichtbogenschweissen
US10688602B2 (en) Submerged arc welding process
EP4596167A1 (de) Flusskerndraht und verfahren zur herstellung einer schweissverbindung
US20190292639A1 (en) Duplex stainless steel material and duplex stainless steel tube
KR20170021891A (ko) 가스 실드 아크 용접용 플럭스 코어드 와이어
EP4159884A1 (de) Fester draht für gasmetalllichtbogenschweissen
EP0688630B2 (de) Fülldraht zum Lichtbogenschweissen in Schutzgas
EP2952286B1 (de) Schweissmetall und geschweisste struktur
JP6241241B2 (ja) オーステナイト系耐熱鋼用溶接材料ならびにそれを用いてなる溶接金属および溶接継手
KR102050857B1 (ko) 피복 아크 용접봉용의 Ni기 합금 심선, 피복 아크 용접봉, 및 피복 아크 용접봉의 제조 방법
EP4596168A1 (de) Schweissmetall, schweissverbindung und schweissstruktur
JPH08257791A (ja) 低水素系被覆アーク溶接棒
KR20070049083A (ko) 고장력강용 가스-실드 아크 용접용의 플럭스 코어 와이어
EP4257281A1 (de) Tig-schweissverbindung
EP4365326A1 (de) Unterpulverschweissverfahren
EP3795290A1 (de) Volldraht zum elektroschlackeschweissen und schweissnaht
EP4663331A1 (de) Gasmetall-lichtbogenschweissverbindung und verfahren zur herstellung davon
JPH0378197B2 (de)
EP4596165A1 (de) Fester draht und verfahren zur herstellung einer schweissverbindung
CN120265421A (zh) 钢材、实芯焊丝以及钢制外皮
EP4353404A1 (de) Metallkerndraht zum unterpulverschweissen und unterpulverschweissverfahren damit

Legal Events

Date Code Title Description
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20240524

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

A4 Supplementary search report drawn up and despatched

Effective date: 20251031

RIC1 Information provided on ipc code assigned before grant

Ipc: B23K 35/30 20060101AFI20251029BHEP

Ipc: B23K 35/36 20060101ALI20251029BHEP

Ipc: B23K 35/02 20060101ALI20251029BHEP

Ipc: B23K 35/362 20060101ALI20251029BHEP

Ipc: B23K 35/368 20060101ALI20251029BHEP

Ipc: C22C 38/08 20060101ALI20251029BHEP

Ipc: C22C 38/02 20060101ALI20251029BHEP

Ipc: C22C 38/04 20060101ALI20251029BHEP

Ipc: C22C 38/06 20060101ALI20251029BHEP

Ipc: C22C 38/10 20060101ALI20251029BHEP

Ipc: C22C 38/12 20060101ALI20251029BHEP

Ipc: C22C 38/14 20060101ALI20251029BHEP

Ipc: C22C 38/16 20060101ALI20251029BHEP

Ipc: C22C 38/18 20060101ALI20251029BHEP

Ipc: C22C 38/40 20060101ALI20251029BHEP

Ipc: C22C 38/42 20060101ALI20251029BHEP

Ipc: C22C 38/44 20060101ALI20251029BHEP

Ipc: C22C 38/46 20060101ALI20251029BHEP

Ipc: C22C 38/50 20060101ALI20251029BHEP

Ipc: C22C 38/52 20060101ALI20251029BHEP

Ipc: C22C 38/54 20060101ALI20251029BHEP